If b is very small as compared to the value of a, so that the cube and other higher powers of b a can be...

Question

If b is very small as compared to the value of a, so that the cube and other higher powers of b a can be neglected in the identity 1 a-b + 1 a-2b + 1 a-3b + + 1 a-nb = n+ n^2+ n^3, Then the value of is :

Accepted Answer

(C)

JEE Main 2021 Mathematics question

Solution